Anthropic · MultimodalReleased 2025-05-22

claude-sonnet-4

anthropic/claude-sonnet-4 id

Claude Sonnet 4 significantly improves on Sonnet 3.7's industry-leading capabilities, excelling in coding with a state-of-the-art 72.7% on SWE-bench. The model balances performance and efficiency for internal and external use cases, with enhanced steerability for greater control over implementations. While not matching Opus 4 in most domains, it delivers an optimal mix of capability and practicality.

Tool useReasoningChat

Type

Use claude-sonnet-4

# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$ 
$ const { text } = await generateText({
$   model: 'anthropic/claude-sonnet-4',
$   baseURL: 'https://synapse.garden/api/v1',
$   apiKey: process.env.MG_KEY,
$   prompt: 'Why is the sky blue?',
$ })

CONTEXT WINDOW

64K

MAX OUTPUT

$3.30/M

INPUT · PER M

$16.50/M

OUTPUT · PER M

PRICING

List prices, every modality.

Rate	Per million tokens · USD
Input	$3.30/M
Output	$16.50/M
Cache read	$0.330/M
Cache write	$4.13/M

Honest list pricesHow we calculate prices

Other Anthropic models

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Model

Input

Output

Context

Type

FAQ · CLAUDE-SONNET-4

Frequently asked

01 / 04

How do I call claude-sonnet-4 from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘anthropic/claude-sonnet-4’ and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does claude-sonnet-4 cost?

Input: $3.30/M per million tokens. Output: $16.50/M per million tokens. The free tier includes a million tokens every month at no cost.

03 / 04

What's the context window for claude-sonnet-4?

claude-sonnet-4 supports a context window of 1M tokens, with a maximum output of 64K tokens.

04 / 04

Do I need a separate Anthropic or OpenAI account?

No. Synapse Garden is the single API surface — one key gives you OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI, Cohere, and more. Billing, rate limits, and audit logs are unified.

READY

Try claude-sonnet-4 in three minutes.

Sign up, create a key, drop our base URL into your existing client. The free tier includes a million tokens every month — no credit card.

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